CN205754048U - The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology - Google Patents
The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology Download PDFInfo
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- CN205754048U CN205754048U CN201620068894.2U CN201620068894U CN205754048U CN 205754048 U CN205754048 U CN 205754048U CN 201620068894 U CN201620068894 U CN 201620068894U CN 205754048 U CN205754048 U CN 205754048U
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- brachium pontis
- igbt module
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Abstract
This utility model provides the distributed full-bridge MMC of auxiliary capacitor based on inequality constraints from all pressing topology.Full-bridge MMC is from all pressing topology, by full-bridge MMC model with from all pressure subsidiary loop joint mappings.Full-bridge MMC model and 6 in all pressure subsidiary loop is by subsidiary loopNIndividual IGBT module generation electrical link, IGBT module triggers, and both constitute the distributed full-bridge MMC of auxiliary capacitor based on inequality constraints from all pressing topology;IGBT module locking, topoligical equivalence is full-bridge MMC topology.This full-bridge MMC is from all pressing topology, DC side fault can be clamped, do not rely on special Pressure and Control simultaneously, can be on the basis of completing the conversion of alternating current-direct current energy, spontaneously realize the equilibrium of submodule capacitor voltage, submodule can be reduced simultaneously accordingly and trigger frequency and capacitor's capacity, it is achieved the fundamental frequency modulation of full-bridge MMC.
Description
Technical field
This utility model relates to flexible transmission field, is specifically related to a kind of auxiliary capacitor based on inequality constraints distributed
Full-bridge MMC is from all pressing topology.
Background technology
Modularization multi-level converter MMC is the developing direction of following HVDC Transmission Technology, and MMC uses submodule (Sub-
Module, SM) mode that cascades constructs converter valve, it is to avoid the directly series connection of big metering device, reduce device conforming
Requirement, simultaneously facilitates dilatation and redundant configuration.Along with the rising of level number, output waveform, close to sinusoidal, can effectively avoid low electricity
The defect of flat VSC-HVDC.
Full-bridge MMC is combined by full-bridge submodule, full-bridge submodule by four IGBT module, a sub-module capacitance and
1 mechanical switch is constituted, and flexible operation has DC Line Fault clamping ability.
Different from two level, three level VSC, the DC voltage of full-bridge MMC is not supported by a bulky capacitor, but by
A series of separate suspension submodule capacitances in series support.In order to ensure waveform quality and the guarantee that AC voltage exports
In module, each power semiconductor bears identical stress, also for preferably supporting DC voltage, reduces alternate circulation, must
Must ensure that submodule capacitor voltage is in the state of dynamic stability at the periodic current disorder of internal organs of brachium pontis power.
Sequence based on capacitance voltage sequence all presses algorithm to be to solve the equilibrium of full-bridge MMC Neutron module capacitance voltage at present to ask
The main flow thinking of topic.But, the realization of ranking function has to rely on the Millisecond sampling of capacitance voltage, needs substantial amounts of sensor
And optical-fibre channel is coordinated;Secondly, when group number of modules increases, the operand of capacitance voltage sequence increases rapidly, for
The hardware designs of controller brings huge challenge;Additionally, submodule is cut-off frequency and has the highest by sequence all realizations of pressure algorithm
Requirement, cut-off frequency with all pressure effect be closely related, in practice process, probably due to all press the restriction of effect, it has to
Improve the triggering frequency of submodule, and then bring the increase that inverter is lost.
Document " A DC-Link Voltage Self-Balance Method for a Diode-Clamped
Modular Multilevel Converter With Minimum Number of Voltage Sensors ", it is proposed that one
Plant the thinking relying on clamp diode and transformator to realize the equilibrium of MMC submodule capacitor voltage.But the program in design
Determining degree and destroy the modular nature of submodule, submodule capacitive energy interchange channel is also confined in mutually, could not be fully sharp
With the existing structure of MMC, introducing of three transformators also brings along bigger being transformed into while making control strategy complicate
This.
Utility model content
For the problems referred to above, the purpose of this utility model is to propose a kind of economy, modular, is independent of all pressing calculation
Method, can reduce submodule simultaneously accordingly and trigger frequency and capacitor's capacity and have the full-bridge MMC of DC Line Fault clamping ability from all
Pressure topology.
The concrete constituted mode of this utility model is as follows.
The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology, including be made up of A, B, C three-phase
Full-bridge MMC model, each brachium pontis of A, B, C three-phase respectively byNIndividual full-bridge submodule and 1 brachium pontis reactor are in series;Including
By 6NIndividual IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitors, 4 auxiliary IGBT module compositions from the most all pressing auxiliary
Loop.
The above-mentioned distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology, in full-bridge MMC model, and A phase
1st submodule of upper brachium pontis, one IGBT module midpoint is upwards connected with dc bus positive pole, another IGBT module
Midpoint is connected with one IGBT module midpoint of the 2nd submodule of brachium pontis in A phase downwards;In A phase the of brachium pontisiIndividual submodule
Block, whereiniValue be 2~N-1, one IGBT module midpoint is upwards with in A phase the of brachium pontisi-1 submodule one
IGBT module midpoint is connected, and another IGBT module midpoint is downwards with in A phase the of brachium pontisiOne IGBT module of+1 submodule
Midpoint is connected;In A phase the of brachium pontisNIndividual submodule, one IGBT module midpoint down through two brachium pontis reactors with under A phase
One IGBT module midpoint of the 1st submodule of brachium pontis is connected, and another IGBT module midpoint is upwards with in A phase the of brachium pontisNOne IGBT module midpoint of-1 submodule is connected;The of the lower brachium pontis of A phaseiIndividual submodule, whereiniValue be 2~N-1,
The of one IGBT module midpoint upwards brachium pontis lower with A phaseiOne IGBT module midpoint of-1 submodule is connected, another
IGBT module midpoint downwards with the of A phase time brachium pontisiOne IGBT module midpoint of+1 submodule is connected;The of the lower brachium pontis of A phaseN
Individual submodule, one IGBT module midpoint is connected with dc bus negative pole downwards, another IGBT module midpoint upwards with A
Descend the of brachium pontis mutuallyNTwo IGBT module midpoints of-1 submodule are connected.B phase and the connection side of C phase upper and lower bridge arm submodule
Formula is consistent with A.
The above-mentioned distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology, in all pressure subsidiary loops,
First auxiliary capacitor and second auxiliary capacitor are in parallel by clamp diode, and second auxiliary capacitor positive pole connects auxiliary
IGBT module, first auxiliary capacitor negative pole connects clamp diode and is incorporated to dc bus positive pole;3rd auxiliary capacitor and
Four auxiliary capacitors are in parallel by clamp diode, and the 3rd auxiliary capacitor negative pole connects auxiliary IGBT module, the 4th auxiliary
Capacitance cathode connects clamp diode and is incorporated to dc bus negative pole;5th auxiliary capacitor and the 6th auxiliary capacitor pass through clamper
Diodes in parallel, the 5th auxiliary capacitor positive pole connects auxiliary IGBT module, and the 6th auxiliary capacitor negative pole connects clamper two pole
Pipe is incorporated to dc bus positive pole;7th auxiliary capacitor and the 8th auxiliary capacitor are in parallel by clamp diode, and the 8th auxiliary
Helping electric capacity negative pole to connect auxiliary IGBT module, the 7th auxiliary capacitor positive pole connects clamp diode and is incorporated to dc bus negative pole.
Clamp diode, by the 1st sub-module capacitance and first auxiliary capacitor positive pole in brachium pontis in IGBT module connection A phase;Logical
Cross IGBT module and connect in A phase in brachium pontis theiIndividual sub-module capacitance and thei+ 1 sub-module capacitance positive pole, whereiniValue be
1~N-1;The is connected in A phase in brachium pontis by IGBT moduleNIndividual sub-module capacitance brachium pontis 1st sub-module capacitance lower with A phase is just
Pole;The is connected in the lower brachium pontis of A phase by IGBT moduleiThe lower brachium pontis of individual sub-module capacitance and A phase thei+ 1 sub-module capacitance is just
Pole, whereiniValue be 1~N-1;The is connected in the lower brachium pontis of A phase by IGBT moduleNIndividual sub-module capacitance and the 3rd auxiliary
Capacitance cathode.Clamp diode, by the 1st sub-module capacitance and second auxiliary electricity in brachium pontis in IGBT module connection B phase
Hold negative pole;The is connected in B phase in brachium pontis by IGBT moduleiIndividual sub-module capacitance and thei+ 1 sub-module capacitance negative pole, whereiniValue be 1~N-1;The is connected in B phase in brachium pontis by IGBT moduleNIndividual sub-module capacitance brachium pontis 1st son lower with B phase
Module capacitance negative pole;The is connected in the lower brachium pontis of B phase by IGBT moduleiThe lower brachium pontis of individual sub-module capacitance and B phase thei+ 1 submodule
Block electric capacity negative pole, whereiniValue be 2~N-1;The is connected in the lower brachium pontis of B phase by IGBT moduleNIndividual sub-module capacitance and the
Four auxiliary capacitor negative poles.When between C phase upper and lower bridge arm Neutron module, the connected mode of clamp diode is consistent with A, the 6th
Auxiliary capacitor positive pole is the sub-module capacitance positive pole of brachium pontis first in auxiliary IGBT module, clamp diode connection C phase, the 5th
Auxiliary capacitor negative pole is the sub-module capacitance negative pole of brachium pontis first in auxiliary IGBT module, clamp diode connection B phase, the 8th
Auxiliary capacitor positive pole connects the lower brachium pontis of C phase the through auxiliary IGBT module, clamp diodeNIndividual sub-module capacitance positive pole, the 7th
Auxiliary capacitor negative pole connects the lower brachium pontis of B phase the through auxiliary IGBT module, clamp diodeNIndividual sub-module capacitance negative pole;In C phase
When between lower brachium pontis Neutron module, the connected mode of clamp diode is consistent with B, the 5th auxiliary capacitor negative pole is through auxiliary IGBT
Module, clamp diode connect the sub-module capacitance negative pole of brachium pontis first in C phase, and the 6th auxiliary capacitor positive pole is through auxiliary IGBT
Module, clamp diode connect the sub-module capacitance positive pole of brachium pontis first in A phase, and the 7th auxiliary capacitor negative pole is through auxiliary IGBT
Module, clamp diode connect the lower brachium pontis of C phase theNIndividual sub-module capacitance negative pole, the 8th auxiliary capacitor positive pole is through auxiliary IGBT
Module, clamp diode connect the lower brachium pontis of A phase theNIndividual sub-module capacitance positive pole.
Accompanying drawing explanation
Fig. 1 is the structural representation of full-bridge submodule;
Fig. 2 is that the distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology.
Detailed description of the invention
For of the present utility model performance and operation principle are expanded on further, below in conjunction with accompanying drawing to the composition to utility model
Mode is specifically described with operation principle.But full-bridge MMC based on this principle is not limited to Fig. 2 from all pressure topologys.
With reference to Fig. 2, the distributed full-bridge MMC of auxiliary capacitor based on inequality constraints from all pressing topology, including by A, B, C tri-
The full-bridge MMC model constituted mutually, each brachium pontis of A, B, C three-phase respectively byNIndividual full-bridge submodule and the series connection of 1 brachium pontis reactor and
Become, including by 6NIndividual IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitors, 4 assist the most equal of IGBT module composition
Pressure subsidiary loop.
In full-bridge MMC model, the 1st submodule of brachium pontis in A phase, one IGBT module midpoint upwards with dc bus
Positive pole is connected, and another IGBT module midpoint is connected with one IGBT module midpoint of the 2nd submodule of brachium pontis in A phase downwards
Connect;In A phase the of brachium pontisiIndividual submodule, whereiniValue be 2 ~N-1, one IGBT module midpoint upwards with bridge in A phase
The of armiOne IGBT module midpoint of-1 submodule is connected, and another IGBT module midpoint is downwards with in A phase the of brachium pontisiOne IGBT module midpoint of+1 submodule is connected;In A phase the of brachium pontisNIndividual submodule, one IGBT module midpoint to
Upper with in A phase the of brachium pontisNOne IGBT module midpoint of-1 submodule is connected, and another IGBT module midpoint is down through two
Individual brachium pontis reactorL 0One IGBT module midpoint of the 1st full-bridge submodule of brachium pontis lower with A phase is connected;The lower brachium pontis of A phase
TheiIndividual submodule, whereiniValue be 2 ~N-1, the of one IGBT module midpoint upwards brachium pontis lower with A phasei-1 submodule
One IGBT module midpoint of block is connected, another IGBT module midpoint downwards with the of A phase time brachium pontisi+ 1 submodule one
IGBT module midpoint is connected;The of the lower brachium pontis of A phaseNIndividual submodule, one IGBT module midpoint is born with dc bus downwards
Pole is connected, the of another IGBT module midpoint upwards brachium pontis lower with A phaseNOne IGBT module midpoint of-1 submodule is connected
Connect.The connected mode of B phase and C phase upper and lower bridge arm submodule is consistent with A.
From all pressing in subsidiary loop, auxiliary capacitorC 1With auxiliary capacitorC 2In parallel by clamp diode, auxiliary capacitorC 2Just
Pole connects auxiliary IGBT moduleT 1, auxiliary capacitorC 1Negative pole connects clamp diode and is incorporated to dc bus positive pole;Auxiliary capacitorC 3With
Auxiliary capacitorC 4In parallel by clamp diode, auxiliary capacitorC 3Negative pole connects auxiliary IGBT moduleT 2, auxiliary capacitorC 4Positive pole is even
Connect clamp diode and be incorporated to dc bus negative pole;Auxiliary capacitorC 5With auxiliary capacitorC 6In parallel by clamp diode, auxiliary capacitorC 5Positive pole connects auxiliary IGBT moduleT 3, auxiliary capacitorC 6Negative pole connects clamp diode and is incorporated to dc bus positive pole;Auxiliary capacitorC 7With auxiliary capacitorC 8In parallel by clamp diode, auxiliary capacitorC 8Negative pole connects auxiliary IGBT moduleT 4, auxiliary capacitorC 7Just
Pole connects clamp diode and is incorporated to dc bus negative pole.Clamp diode, passes through IGBT moduleT au_1Connect in A phase in brachium pontis the
1 sub-module capacitanceC au_1With auxiliary capacitorC 1Positive pole;Pass through IGBT moduleT au_i 、T au_i+1Connect in A phase in brachium pontis theiHeight
Module capacitanceC au_i Withi+ 1 sub-module capacitanceC au_i+1Positive pole, whereiniValue be 1~N-1;Pass through IGBT moduleT au_N 、T al_1Connect in A phase in brachium pontis theNIndividual sub-module capacitanceC au_N Brachium pontis 1st sub-module capacitance lower with A phaseC al_1Positive pole;Pass through
IGBT module Tal_i 、T al_i+1Connect in the lower brachium pontis of A phase theiIndividual sub-module capacitanceC al_i Brachium pontis lower with A phase thei+ 1 submodule electricity
HoldC al_i+1Positive pole, whereiniValue be 1~N-1;Pass through IGBT moduleT al_N Connect in the lower brachium pontis of A phase theNIndividual submodule electricity
HoldC al_N With auxiliary capacitorC 3Positive pole.Clamp diode, passes through IGBT moduleT bu_11st submodule electricity in brachium pontis in connection B phase
HoldC bu_1With auxiliary capacitorC 2, auxiliary capacitorC 5Negative pole;Pass through IGBT moduleT bu_i 、T bu_i+1Connect in B phase in brachium pontis theiHeight
Module capacitanceC bu_i Withi+ 1 sub-module capacitanceC bu_i+1Negative pole, whereiniValue be 1~N-1;Pass through IGBT moduleT bu_N 、T bl_1Connect in B phase in brachium pontis theNIndividual sub-module capacitanceC bu_N Brachium pontis 1st sub-module capacitance lower with B phaseC bl_1Negative pole;Pass through
IGBT moduleT bl_i 、T bl_i+1Connect in the lower brachium pontis of B phase theiIndividual sub-module capacitanceC bl_i Brachium pontis lower with B phase thei+ 1 submodule electricity
HoldC bl_i+1Negative pole, whereiniValue be 1~N-1;Pass through IGBT moduleT bl_N Connect in the lower brachium pontis of B phase theNIndividual submodule electricity
HoldC bl_N With auxiliary capacitorC 4, auxiliary capacitorC 7Negative pole.Auxiliary capacitorC 6Positive pole is through auxiliary IGBT moduleT cu_1, clamp diode even
Connect first sub-module capacitance of brachium pontis in C phaseC cu_1Positive pole;Auxiliary capacitorC 8Positive pole is through auxiliary IGBT moduleT cl_N , clamper two pole
Pipe connects the lower brachium pontis of C phase theNIndividual sub-module capacitanceC cl_N Positive pole.
Under normal circumstances, from the most all pressure subsidiary loop in 6NIndividual IGBT moduleT au_i 、T al_i 、T bu_i、T bl_i 、T cu_i 、T cl_i Often
Close, whereiniValue be 1~N, first sub-module capacitance of brachium pontis in A phaseC au_1During bypass, now assist IGBT moduleT 1Disconnected
Open, submodule electric capacityC au_1With auxiliary capacitorC 1In parallel by clamp diode;Brachium pontis in A phaseiIndividual sub-module capacitanceC au_i Other
Lu Shi, whereiniValue be 2~N, submodule electric capacityC au_i With submodule electric capacityC au_i-1In parallel by clamp diode;A phase
First sub-module capacitance of lower brachium pontisC al_1During bypass, submodule electric capacityC al_1By clamp diode, two brachium pontis reactorsL 0
With submodule electric capacityC au_N In parallel;The lower brachium pontis of A phase theiIndividual sub-module capacitanceC al_i During bypass, whereiniValue be 2~N, submodule
Block electric capacityC al_i With submodule electric capacityC al_i-1In parallel by clamp diode;Auxiliary IGBT moduleT 2During Guan Bi, auxiliary capacitorC 3
By clamp diode and submodule electric capacityC al_N In parallel.
Under normal circumstances, from the most all pressure subsidiary loop in 6NIndividual IGBT moduleT au_i 、T al_i 、T bu_i、T bl_i 、T cu_i 、T cl_i Often
Close, whereiniValue be 1~N, assist IGBT moduleT 1During Guan Bi, auxiliary capacitorC 2With submodule electric capacityC bu_1By clamper two
Pole pipe is in parallel;Brachium pontis in B phaseiIndividual sub-module capacitanceC bu_i During bypass, whereiniValue be 1~N-1, submodule electric capacityC bu_i
With submodule electric capacityC bu_i+1In parallel by clamp diode;Brachium pontis in B phaseNIndividual sub-module capacitanceC bu_N During bypass, submodule
Electric capacityC bu_N By clamp diode, two brachium pontis reactorsL 0With submodule electric capacityC bl_1In parallel;The lower brachium pontis of B phase theiIndividual submodule
Block electric capacityC bl_i During bypass, whereiniValue be 1~N-1, submodule electric capacityC bl_i With submodule electric capacityC bl_i+1By clamper two
Pole pipe is in parallel;The lower brachium pontis of B phase theNIndividual sub-module capacitanceC bl_N During bypass, submodule electric capacityC bl_N With auxiliary capacitorC 4Pass through clamper
Diodes in parallel.Wherein assist IGBT moduleT 1Triggering signal and first submodule of brachium pontis in A phase to trigger signal consistent;Auxiliary
Help IGBT moduleT 2The lower brachium pontis of triggering signal and B phase theNThe triggering signal of individual submodule is consistent.
During orthogonal stream energy is changed, each submodule alternately puts into, bypass, assists IGBT moduleT 1、T 2Alternately
Guan Bi, shutoff, A, B phase upper and lower bridge arm submodule capacitor voltage, under the effect of clamp diode, meets and descends column constraint:
Due to auxiliary capacitorC 1、C 2、C 3、C 4The relation of voltage meets:
In like manner, B, C phase upper and lower bridge arm submodule capacitor voltage meets following condition:
Due to auxiliary capacitorC 5、C 6、C 7、C 8The relation of voltage meets:
It follows that at single clamp MMC in the dynamic process completing the conversion of orthogonal stream energy, meet following constraint bar
Part:
Being illustrated from above-mentioned, this full-bridge MMC topology possesses submodule capacitor voltage from the ability of equalization.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole realities
Execute example.Based on the embodiment in the application, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly fall into the application protection scope.
Claims (4)
1. the distributed full-bridge MMC of auxiliary capacitor based on inequality constraints is from all pressing topology, it is characterised in that: include by A, B, C
Three-phase constitute full-bridge MMC model, each brachium pontis of A, B, C three-phase respectively byNIndividual full-bridge submodule and 1 brachium pontis reactor series connection
Form;Including by 6NIndividual IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitorsC 1、C 2、C 3、C 4、C 5、C 6、C 7、C 8, 4
Auxiliary IGBT moduleT 1、T 2、T 3、T 4Constitute the most all presses subsidiary loop.
The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints the most according to claim 1 is from all pressing topology, and it is special
Levy and be: in full-bridge MMC model, the 1st submodule of brachium pontis in A phase, one IGBT module midpoint upwards with dc bus
Positive pole is connected, and another IGBT module midpoint is connected with one IGBT module midpoint of the 2nd submodule of brachium pontis in A phase downwards
Connect;In A phase the of brachium pontisiIndividual submodule, whereiniValue be 2 ~N-1, one IGBT module midpoint upwards with bridge in A phase
The of armiOne IGBT module midpoint of-1 submodule is connected, and another IGBT module midpoint is downwards with in A phase the of brachium pontisiOne IGBT module midpoint of+1 submodule is connected;In A phase the of brachium pontisNIndividual submodule, one IGBT module midpoint to
Upper with in A phase the of brachium pontisNOne IGBT module midpoint of-1 submodule is connected, and another IGBT module midpoint is down through two
Individual brachium pontis reactorL 0One IGBT module midpoint of the 1st full-bridge submodule of brachium pontis lower with A phase is connected;The lower brachium pontis of A phase
TheiIndividual submodule, whereiniValue be 2 ~N-1, the of one IGBT module midpoint upwards brachium pontis lower with A phasei-1 submodule
One IGBT module midpoint of block is connected, another IGBT module midpoint downwards with the of A phase time brachium pontisi+ 1 submodule one
IGBT module midpoint is connected;The of the lower brachium pontis of A phaseNIndividual submodule, one IGBT module midpoint is born with dc bus downwards
Pole is connected, the of another IGBT module midpoint upwards brachium pontis lower with A phaseNOne IGBT module midpoint of-1 submodule is connected
Connect;The connected mode of B phase and C phase upper and lower bridge arm submodule is consistent with A;At A, B, C phase upper and lower bridge armiIndividual submodule
Mechanical switch it is parallel with respectively up and down between output leadK au_i ,K al_i ,K bu_i ,K bl_i ,K cu_i ,K cl_i , whereiniValue be 1 ~N;
A, B, C three-phase status that above-mentioned annexation is constituted is consistent.
The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints the most according to claim 1 is from all pressing topology, and it is special
Levy and be: in all pressure subsidiary loops, auxiliary capacitorC 1With auxiliary capacitorC 2In parallel by clamp diode, auxiliary capacitorC 2Just
Pole connects auxiliary IGBT moduleT 1, auxiliary capacitorC 1Negative pole connects clamp diode and is incorporated to dc bus positive pole;Auxiliary capacitorC 3With
Auxiliary capacitorC 4In parallel by clamp diode, auxiliary capacitorC 3Negative pole connects auxiliary IGBT moduleT 2, auxiliary capacitorC 4Positive pole is even
Connect clamp diode and be incorporated to dc bus negative pole;Auxiliary capacitorC 5With auxiliary capacitorC 6In parallel by clamp diode, auxiliary capacitorC 5Positive pole connects auxiliary IGBT moduleT 3, auxiliary capacitorC 6Negative pole connects clamp diode and is incorporated to dc bus positive pole;Auxiliary capacitorC 7With auxiliary capacitorC 8In parallel by clamp diode, auxiliary capacitorC 8Negative pole connects auxiliary IGBT moduleT 4, auxiliary capacitorC 7Just
Pole connects clamp diode and is incorporated to dc bus negative pole;Clamp diode, passes through IGBT moduleT au_1Connect in A phase in brachium pontis the
1 sub-module capacitanceC au_1With auxiliary capacitorC 1Positive pole;Pass through IGBT moduleT au_i 、T au_i+1Connect in A phase in brachium pontis theiHeight
Module capacitanceC au_i Withi+ 1 sub-module capacitanceC au_i+1Positive pole, whereiniValue be 1~N-1;Pass through IGBT moduleT au_N 、T al_1Connect in A phase in brachium pontis theNIndividual sub-module capacitanceC au_N Brachium pontis 1st sub-module capacitance lower with A phaseC al_1Positive pole;Pass through
IGBT module Tal_i 、T al_i+1Connect in the lower brachium pontis of A phase theiIndividual sub-module capacitanceC al_i Brachium pontis lower with A phase thei+ 1 submodule electricity
HoldC al_i+1Positive pole, whereiniValue be 1~N-1;Pass through IGBT moduleT al_N Connect in the lower brachium pontis of A phase theNIndividual submodule electricity
HoldC al_N With auxiliary capacitorC 3Positive pole;Clamp diode, passes through IGBT moduleT bu_11st submodule electricity in brachium pontis in connection B phase
HoldC bu_1With auxiliary capacitorC 2Negative pole;Pass through IGBT moduleT bu_i 、T bu_i+1Connect in B phase in brachium pontis theiIndividual sub-module capacitanceC bu_i Withi+ 1 sub-module capacitanceC bu_i+1Negative pole, whereiniValue be 1~N-1;Pass through IGBT moduleT bu_N 、T bl_1Connect
In B phase in brachium pontisNIndividual sub-module capacitanceC bu_N Brachium pontis 1st sub-module capacitance lower with B phaseC bl_1Negative pole;Pass through IGBT moduleT bl_i 、T bl_i+1Connect in the lower brachium pontis of B phase theiIndividual sub-module capacitanceC bl_i Brachium pontis lower with B phase thei+ 1 sub-module capacitanceC bl_i+1
Negative pole, whereiniValue be 1~N-1;Pass through IGBT moduleT bl_N Connect in the lower brachium pontis of B phase theNIndividual sub-module capacitanceC bl_N With
Auxiliary capacitorC 4Negative pole;When between C phase upper and lower bridge arm Neutron module, the connected mode of clamp diode is consistent with A, auxiliary capacitorC 6
Positive pole is through IGBT moduleT cu_1, clamp diode connect first sub-module capacitance of brachium pontis in C phaseC cu_1Positive pole, auxiliary capacitorC 5
Negative pole is through IGBT moduleT bu_1, clamp diode connect first sub-module capacitance of brachium pontis in B phaseC bu_1Negative pole, auxiliary capacitorC 8
Positive pole is through IGBT moduleT cl_N , clamp diode connect the lower brachium pontis of C phase theNIndividual sub-module capacitanceC cl_N Positive pole, auxiliary capacitorC 7Negative
Pole is through IGBT moduleT bl_N , clamp diode connect the lower brachium pontis of B phase theNIndividual sub-module capacitanceC bl_N Negative pole;In C phase upper and lower bridge arm
When between submodule, the connected mode of clamp diode is consistent with B, auxiliary capacitorC 5Negative pole is through IGBT moduleT cu_1, clamper two pole
Pipe connects first sub-module capacitance of brachium pontis in C phaseC cu_1Negative pole, auxiliary capacitorC 6Positive pole is through IGBT moduleT au_1, clamper two pole
Pipe connects first sub-module capacitance of brachium pontis in A phaseC au_1Positive pole, auxiliary capacitorC 7Negative pole is through IGBT moduleT cl_N , clamper two pole
Pipe connects the lower brachium pontis of C phase theNIndividual sub-module capacitanceC cl_N Negative pole, auxiliary capacitorC 8Positive pole is through IGBT moduleT al_N , clamp diode
Connect the lower brachium pontis of A phase theNIndividual sub-module capacitanceC al_N Positive pole;In above-mentioned A, B, C three-phase 6NIndividual IGBT moduleT au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i , whereiniValue be 1~N, 6N+ 11 clamp diodes, 8 auxiliary capacitorsC 1、C 2、C 3、C 4、C 5、C 6、C 7、C 8And 4 auxiliary IGBT moduleT 1、T 2、T 3、T 4, collectively form from all pressing subsidiary loop.
The distributed full-bridge MMC of auxiliary capacitor based on inequality constraints the most according to claim 1 is from all pressing topology, and it is special
Levy and be: during normal condition, from the most all pressure subsidiary loop in 6NIndividual IGBT moduleT au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i Often
Close, during failure condition, 6NIndividual IGBT moduleT au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i Disconnect, whereiniValue be 1~N;
Under normal circumstances, first sub-module capacitance of brachium pontis in A phaseC au_1During bypass, now assist IGBT moduleT 1Disconnect, submodule electricity
HoldC au_1With auxiliary capacitorC 1In parallel by clamp diode;Brachium pontis in A phaseiIndividual sub-module capacitanceC au_i During bypass, whereini
Value be 2~N, submodule electric capacityC au_i With submodule electric capacityC au_i-1In parallel by clamp diode;The lower brachium pontis first of A phase
Individual sub-module capacitanceC al_1During bypass, submodule electric capacityC al_1By clamp diode, two brachium pontis reactorsL 0With submodule electricity
HoldC au_N In parallel;The lower brachium pontis of A phase theiIndividual sub-module capacitanceC al_i During bypass, whereiniValue be 2~N, submodule electric capacityC al_i
With submodule electric capacityC al_i-1In parallel by clamp diode;Auxiliary IGBT moduleT 2During Guan Bi, auxiliary capacitorC 3By clamper two
Pole pipe and submodule electric capacityC al_N In parallel;Auxiliary IGBT moduleT 1During Guan Bi, auxiliary capacitorC 2With submodule electric capacityC bu_1By pincers
Position diodes in parallel;Brachium pontis in B phaseiIndividual sub-module capacitanceC bu_i During bypass, whereiniValue be 1~N-1, submodule electricity
HoldC bu_i With submodule electric capacityC bu_i+1In parallel by clamp diode;Brachium pontis in B phaseNIndividual sub-module capacitanceC bu_N During bypass,
Submodule electric capacityC bu_N By clamp diode, two brachium pontis reactorsL 0With submodule electric capacityC bl_1In parallel;The lower brachium pontis of B phase thei
Individual sub-module capacitanceC bl_i During bypass, whereiniValue be 1~N-1, submodule electric capacityC bl_i With submodule electric capacityC bl_i+1Pass through
Clamp diode is in parallel;The lower brachium pontis of B phaseNIndividual sub-module capacitanceC bl_N During bypass, submodule electric capacityC bl_N With auxiliary capacitorC 4Pass through
Clamp diode is in parallel;Wherein assist IGBT moduleT 1Trigger signal and the triggering signal of first submodule of brachium pontis in A phase
Unanimously;Auxiliary IGBT moduleT 2The lower brachium pontis of triggering signal and B phase theNThe triggering signal of individual submodule is consistent;At straight alternating current energy
During amount conversion, each submodule alternately puts into, bypass, assists IGBT moduleT 1、T 2Being alternately closed, turn off, A phase is upper and lower
Brachium pontis submodule capacitor voltage, under the effect of clamp diode, meets lower column constraint,U C1≥U Cau_1≥U Cau_2…≥U Cau_N ≥U Cal_1≥U Cal_2…≥U Cal_N ≥U C3;B phase upper and lower bridge arm submodule capacitor voltage is under the effect of clamp diode, under meeting
Column constraint,U C2≤U Cbu_1≤U Cbu_2…≤U Cbu_N ≤U Cbl_1≤U Cbl_2…≤U Cbl_N ≤U C4;Against auxiliary capacitorC 1、C 2Electricity
Between pressure, auxiliary capacitorC 3、C 4Two inequality constraints between voltage,U C1≤U C2,U C3≥U C4, the 4 of A, B phase upper and lower bridge armN
Individual sub-module capacitance,C au_i 、C al_i 、C bu_i 、C bl_i , whereiniValue be 1~N, and auxiliary capacitorC 1、C 2、C 3、C 4, voltage
Being in self-balancing state, A, B of topology are alternate possesses submodule capacitor voltage from the ability of equalization;If the composition shape of C phase in topology
Formula is consistent with A, then pass through auxiliary capacitorC 5、C 6、C 7、C 8Effect, between constraints and A, B of C, B capacitive coupling voltage
Capacitance voltage constraints is similar to;If the form of the composition of C phase is consistent with B in topology, then pass through auxiliary capacitorC 5、C 6、C 7、C 8
Effect, the constraints of A, C capacitive coupling voltage is similar with capacitance voltage constraints between A, B.
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CN105471306B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | Auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure |
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